Disclosed is a portable communication apparatus with a data-inputting expansion comprising a main housing having a display device; a rotatable housing having first and second data-inputting devices on its upper and lower surfaces, respectively, the rotatable housing rotatably connected to the main housing while facing the main housing; a connecting portion with a contact surface exposed on one side of the front surface of the main housing; a first terminal with a contact surface exposed on one side of the rear surface of the rotatable housing, the first terminal being connected to the first data-inputting device; and a second terminal with a contact surface exposed on the other side of the rear surface of the rotatable housing, the second terminal being connected to the second data-inputting device, wherein connection is made between the connecting portion and one of the first or second terminals, as chosen by the rotation of the rotatable housing.